Suction stack for chimneys



Aug. 1, 1933. PETRQVITCH 1,920,884

SUCTION STACK FOR CHIMNEYS Filed Jan. 9, 1930 2 Sheets-Sheet l I Arm/1L7 Aug. 1, L p ov c 1,920,884

SUCTION STACK FOR CHIMNEYS Filed Jan. 9. 1930 2 Sheets-Sheet 2 5 n; 441 TM 1 l: 12 ATTO/f/Yf Patented Aug. 1, 1933 UNITED STATES 1,920,884 SUCTION STACK FOR CHIMNEYS Louis Petrovitch, Paris, France Application January 9,

1930, Serial No. 419,709,

and in France January 10, 1929 1 Claim.

This invention has for its object a smoke stack designed in such manner as to provide for a positive suction of the smoke while avoiding any downflow of the same, this result being obtained irrespective of the direction of the wind and by the very action of the latter.

In order that the invention may more easily be understood, it will now be further described with the aid of the accompanying drawings wherein the suction smoke stack providing the subject matter of the invention is shown by way of example.

In the drawings:

Figure l is an elevational View of one embodiment of the invention comprising five flues.

Figure 2 is a cross section taken on line AB of Fig. 1;

Figure 3 is an elevational view of a modification of Figure 1. t

Figure 4 is a cross sectional view taken on line C-D of Figure 3.

Figures 5 and 6 show a modification of Figures 3 and 4, Figure 6 being a cross section taken on line C'D' of Figure 5. As shown in this figure, the vertical partitions are hollow in 7 construction.

The devices shown in Figs. 1 and 2 will now first be described.

The stack proper is indicated at 1; same may have any desired ornamental shape and comprise any desired number of flues. Above the fines 2 there is arranged the sucking device proper embodying this invention, which provides the crowning of the stack 1. The said device comprises one or a plurality of lateral ducts 3 arranged above one another on either side of the vertical longitudinal median plane of the stack and leading from each flue 2 of the latter; the said ducts are bounded by lateral convergent partitions 4 arranged vertically and by longitudinal sloping walls 5 as clearly shown in Fig. 2. I

It is to be noted that the bases of the lower ducts 3 have a steeper gradient than the intermediate walls 5 in order to provide choked apertures through which air is admitted with increased speed into the central flues 2, whereby the smoke is drawn 01f through the apertures in the other side of the stack which are flared out. This feature will be dealt with in more detailed manner hereinafter.

If we assume that the outside wind is blowing in a direction normal to the cambered cover 8, it will become spread thereagainst and will flow past the ducts 3, whereby its spread creates in each duct a depression which is transmitted through the fiues 2, the smoke being thus driven off downwardly along the sides of the stack.

It is to be noted that as a result of the lower ducts 3 being steeper and having more restricted outlets than the ducts 3 next above, the smoke becomes accelerated as it flows past the said lower ducts, and sucked as it reaches the level of the upper ducts 3, the flared out orifices contributing to such sucking action.

Assuming now that the wind is blowing obliquely from the upper right hand side of Figure 2, part of the wind will enter the ducts 3 on one side of the stack and go right out through the ducts 3 on the opposite side, thus carrying away the smoke ascending in the flue 2, while the portion of the wind striking the lower inclined face of the lower ducts 3 fiows vertically down along the side of the stack and sets up a depression in the lower ducts 3 and as the smoke reaches the said ducts on the windward side of the stack it will be sucked out downwardly.

A modification of Fig. 1 is shown in Figs. 3 and 4 wherein the vertical walls 4 are formed at their outer edges with a pair of oblique portions 12 inclined in reverse directions. Moreover, the walls in the upper row are so arranged that the portions 12 just referred to and those in the lower row are also inclined in reversed directions.

Referring now to Figs. 5 and 6, the walls 4 are similar to those shown in Figs. 3 and 4, the directions however being the same for both the upper and lower rows.

The conditions being the same, the device will operate in the same manner in all cases. Effectively, the same converging and diverging partitions are to be found in all cases in the joint planes of the flues, this arrangement causing the wind to be concentrated directly above the fiues, the speed of the wind setting up a suction upon the said flues. The partitions moreover serve to render the fiues wholly independent of one another, any objectionable flow of the smoke from one flue into another by the action of the sun or the wind being thus avoided, such backfiow being chiefly undesirable in the case of dwellings.

What I claim is:

A suction stack for chimneys having a plurality of fines, comprising a plurality of vertical partitions arranged between the fines, each of said partitions having oppositely disposed defiected tapered edges inclined in opposite directions, and longitudinal downwardly deflected partitions secured to said vertical members at opposite sides of the stack.

LOUIS PETROVITCH. 

